Method for detecting tie-in strip and expansion adhesive materials in CAE pedestrian protection head collision

Abstract

The present invention discloses a method for detecting tie-in strip and expansion adhesive materials in CAE pedestrian protection head collision. The method has the technical points that: a welding spot data unit of an engine hood, a white body, abdeckung stossfaenger, an engine, a heat sink and front windshield glass, a protection welding data unit of the engine hood, the white body, the abdeckung stossfaenger, the engine, the heat sink and the front windshield glass, an engine hood tie-in strip data unit and an engine hood expansion adhesive data unit are connected with the input end of a data conversion unit by the data conversion unit and the input end of the data conversion unit is also connected with a finite element mesh model; the output end of the data conversion unit is connected with the input end of a CAE acceleration curve acquisition unit sequentially through a vip2 file conversion unit and a CAE simulation analysis unit; measured data in a physical test acquisition unit is also connected with a physical test acceleration curve acquisition unit after being subjected to calculation processing by the finite element mesh model so as to obtain a head acceleration curve; and the output ends of the CAE acceleration curve acquisition unit and the physical test acceleration curve acquisition unit are connected with a comparison unit. Known from comparison, a CAE acceleration obtained by the method disclosed by the present invention is consistent with a physical test curve in trend, and is universal, thereby determining reliability of the method.

Description

technical field [0001] The invention belongs to the technical field of motor vehicle material detection, in particular to a method for detecting edge wrapping rubber and expansion rubber materials in CAE pedestrian protection head collision. Background technique [0002] According to statistics, traffic accidents in the world cause 1.2 million deaths every year, and 65% of traffic accidents are collision accidents between people and vehicles. In the United States, Europe and Japan, the death of pedestrians in traffic accidents accounts for 11% to 30% of the total traffic fatalities. In developing countries, there are a large number of mixed pedestrian and vehicle roads. higher. The death toll and death rate of road traffic injuries in my country ranks among the top in the world. Statistics released by the Ministry of Public Security show that the casualty rate of vulnerable groups in traffic accidents reaches 63%. [0003] According to IHRA (International Harmonized Resear...

AI Technical Summary

Problems solved by technology

[0005] In the process of pedestrian protection modeling, the design department generally cannot provide the test curves of the wrapping rubber and expansion rubber materials. To obtain the material parameters that can be used in engineering, they can only obtain relevant curves by various means. Usually engineers are troubled by this

The traditional method is to use the compressible plastic material No. 124 in the ls-dyna software library to simulate the wrapping rubber and expansion rubber. This simulation method has less impact on high-speed collisions, but has less impact on pedestrian protection. Large, there are the following two key points: 1. There is no material parameter of wrapping rubber and expansion rubber during modeling, and the area of ​​the head impact point is close to the wrapping rubber and expansion rubber, which will affect the result of head injury value, and then affect the export star rating ;2. The calculation of high-speed collision analysis is easy to fail to converge, mainly because the energy curve is not conserved, and it takes time to debug the results. The above has brought great inconvenience to the engineer and increased the project development time

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